Polypropylene resin cellular molded article having a skin and pr

Details Polypropylene resin cellular molded article having a skin and pr Polypropylene resin cellular molded article having a skin and pr

1997-05-27

2000-03-07

Copenheaver, Blaine

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

428132, 4283171, 4283186, 4283199, B32B 326

Patent

active

060337702

ABSTRACT:
A cellular molded article (11) of a polypropylene resin having a skin (8) was produced by placing a skin material (8) on the interior surface of a die A (13), clamping the die A (13) with a die B (14) to form a mold (7), then charging the mold (7) with pre-expanded particles of a polyethylene resin, pre-heating the pre-expanded particles using steam supplied through the vapor holes (4) of the die B (14) at a temperature lower than the temperature at which the pre-expanded particles are melt bonded together, then holding to the pre-expanded particles in said steam, and next performing the main heating of the pre-expanded particles through the die B (14) at a temperature not less than the temperature at which the pre-expanded particles are melt bonded together. At the time of the main heating of the pre-expanded particles through the die B (14), the die A (13) may also be heated up as needed.

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patent: 5073444 (1991-12-01), Shanelec
patent: 5085814 (1992-02-01), Kamiyama et al.
patent: 5196151 (1993-03-01), Sakaida et al.

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